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fgiga [73]
3 years ago
14

What is the total number of valence electrons in a silicate ion sio32-?

Chemistry
1 answer:
olga2289 [7]3 years ago
4 0
Valence  electrons  are number  of the  electrons  in  the   outermost   shell of  an  atom
silicon  has  4   valence  electrons
oxygen  has  2  since  in SiO3^-2  they  are  3  this  make  valence   electrons  to  be   6
SiO3^-2  have   negative  charge of  two  thes  means  has   two  extra electrons hence   has  2  valence  electrons
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What is the volume of as sample that has a mass of 40.0 g and a density of 4.30 g/mL?
kati45 [8]

Explanation:

density = mass/volume so volume = mass/density = 40/4.30

4 0
3 years ago
What is the oxidation number of HCLO4?
ki77a [65]
E.g. in H3PO4 (O, -2).
8. The sum of the oxidation states of all the atoms in a species must be equal to net charge on the species. e.g. Net Charge of HClO4 = 0, i.e. [+1(H)+7(Cl)-2<span>*4(O)] = 0.</span>
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3 years ago
During a lab, you heat 1.62 g of a CoCl2 hydrate over a Bunsen burner. After heating, the final mass of the dehydrated compound
sashaice [31]
Answer is: formula of hydrate is CoCl₂· 6H₂O -c<span>obalt(II) chloride hexahydrate
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n(CoCl₂) = m(CoCl₂) ÷ M(CoCl₂)
n(CoCl₂) = 0,88 g ÷ 130 g/mol
n(CoCl₂) = 0,0068 mol.
m(H₂O) = 1,62 g - 0,88 g.
m(H₂O) = 0,74 g.
n(H₂O) = m(H₂O) ÷ m(H₂O) 
n(H₂O) = 0,74 g ÷ 18 g/mol
n(H₂O) = 0,041 mol.
n(CoCl₂) : n(H₂O) = 0,0068 mol : 0,041 mol.
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8 0
3 years ago
Black coffee has a pH of around 5. Since pH and pOH have an inverse relationship, black coffee has a pOH of ___.
Anon25 [30]

Answer:

pOH = 9.

Explanation:

The inverse relationship between the pH and pOH of any given solution can be written as:

pH = 14 - pOH

Or conversely:

pOH = 14 - pH

With the above information in mind we can <u>use the given pH to calculate the pOH</u>:

pOH = 14 - pH

pOH = 14 - 5

pOH = 9

Thus, black coffee has a pOH of 9.

5 0
3 years ago
Balance this chemical equation <br><br>Cu(OH)2+ HCl --&gt; CuCl2 + H2O​
Finger [1]

Answer:

Cu(OH)2 + 2HCl → CuCl2 + 2H2O

5 0
2 years ago
Read 2 more answers
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